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DEPOSITS - Summary of Deposit Balances (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Deposits [Line Items]      
Non-interest bearing checking accounts $ 1,578,142 $ 1,484,155 $ 1,578,142
Savings accounts 2,345,664 2,518,496  
Interest-bearing checking accounts 1,155,367 1,075,929  
Certificates of deposit 2,409,876 2,312,928  
Brokered certificates of deposit 1,253,844 1,439,697  
Total deposits $ 8,742,893 $ 8,831,205 $ 8,742,893